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41.

The forget command deletes a snapshot. This operation can not be
undone.

A snapshot contains archives for the user, system and configuration
data of each snap included in the snapshot.

By default, this command forgets all the data in a snapshot.
Alternatively, you can specify the data of which snaps to forget.

42.

The get command prints configuration options for the current snap.

$ snapctl get username
frank

If multiple option names are provided, a document is returned:

$ snapctl get username password
{
"username": "frank",
"password": "..."
}

Nested values may be retrieved via a dotted path:

$ snapctl get author.name
frank

Values of interface connection settings may be printed with:

$ snapctl get :myplug usb-vendor
$ snapctl get :myslot path

This will return the named setting from the local interface endpoint,
regardless whether it's a plug or a slot. Returning the setting from the
connected snap's endpoint is also possible by requesting the setting explicitly
with optional --plug and --slot command options:

$ snapctl get :myplug --slot usb-vendor

This requests the "usb-vendor" setting from the slot that is connected to
"myplug".

43.

The get command prints configuration options for the provided snap.

$ snap get snap-name username
frank

If multiple option names are provided, the corresponding values are returned:

$ snap get snap-name username password
Key Value
username frank
password ...

Nested values may be retrieved via a dotted path:

$ snap get snap-name author.name
frank

44.

The help command displays information about snap commands.

45.

The info command shows detailed information about snaps.

The snaps can be specified by name or by path; names are looked for both in the
store and in the installed snaps; paths can refer to a .snap file, or to a
directory that contains an unpacked snap suitable for 'snap try' (an example
of this would be the 'prime' directory snapcraft produces).

46.

The install command installs components.

47.

The install command installs the named snaps on the system.

To install multiple instances of the same snap, append an underscore and a
unique identifier (for each instance) to a snap's name.

Parallel instances are installed with --unaliased passed implicitly to avoid
conflicts with existing installs. This behaviour can be altered by passing
--prefer which will enable all aliases of the given snap in preference to
conflicting aliases of other snaps whose automatic aliases will be disabled and
manual aliases will be removed.

With no further options, the snaps are installed tracking the stable channel,
with strict security confinement. All available channels of a snap are listed in
its 'snap info' output.

When --revision is used, a later refresh will typically undo the revision
override, taking the snap back to the current revision of the channel it's
tracking.

Use --name to set the instance name when installing from snap file.

48.

The interface command shows details of snap interfaces.

If no interface name is provided, a list of interface names with at least
one connection is shown, or a list of all interfaces if --all is provided.

49.

The interfaces command lists interfaces available in the system.

By default all slots and plugs, used and offered by all snaps, are displayed.

$ snap interfaces <snap>:<slot or plug>

Lists only the specified slot or plug.

$ snap interfaces <snap>

Lists the slots offered and plugs used by the specified snap.

$ snap interfaces -i=<interface> [<snap>]

Filters the complete output so only plugs and/or slots matching the provided
details are listed.

NOTE this command is deprecated and has been replaced with the 'connections'
command.

50.

The is-connected command returns success if the given plug or slot of the
calling snap is connected, and failure otherwise.

$ snapctl is-connected plug
$ echo $?
1

Snaps can only query their own plugs and slots - snap name is implicit and
implied by the snapctl execution context.

The --list option lists all connected plugs and slots.

The --pid and --aparmor-label options can be used to determine whether
a plug or slot is connected to the snap identified by the given
process ID or AppArmor label. In this mode, additional failure exit
codes may be returned: 10 if the other snap is not connected but uses
classic confinement, or 11 if the other process is not snap confined.

The --pid and --apparmor-label options may only be used with slots of
interface type "pulseaudio", "audio-record", or "cups-control".